Examples with IndexReader gate.creole.annic.apache.lucene.index.IndexReader used on opensource projects

Example 1 with IndexReader

use of gate.creole.annic.apache.lucene.index.IndexReader in project gate-core by GateNLP.

the class LuceneIndexer method remove.

/**
 * remove documents from the Index
 *
 * @param removedIDs - when documents are not
 *          peristed, Persistence IDs will not be available In that
 *          case provide the document Names instead of their IDs
 * @throws Exception
 */
@Override
public void remove(List<Object> removedIDs) throws IndexException {
    String location = null;
    try {
        location = new File(((URL) parameters.get(Constants.INDEX_LOCATION_URL)).toURI()).getAbsolutePath();
    } catch (URISyntaxException use) {
        location = new File(((URL) parameters.get(Constants.INDEX_LOCATION_URL)).getFile()).getAbsolutePath();
    }
    try {
        IndexReader reader = IndexReader.open(location);
        try {
            // let us first remove the documents which need to be removed
            if (removedIDs != null) {
                for (int i = 0; i < removedIDs.size(); i++) {
                    String id = removedIDs.get(i).toString();
                    Set<String> serializedFilesIDs = getNamesOfSerializedFiles(id);
                    if (serializedFilesIDs.size() > 0) {
                        System.out.print("Removing => " + id + "...");
                        id = getCompatibleName(id);
                        File file = new File(location, Constants.SERIALIZED_FOLDER_NAME);
                        file = new File(file, id);
                        for (String serializedFileID : serializedFilesIDs) {
                            gate.creole.annic.apache.lucene.index.Term term = new gate.creole.annic.apache.lucene.index.Term(Constants.DOCUMENT_ID_FOR_SERIALIZED_FILE, serializedFileID);
                            reader.delete(term);
                            serializedFileID = getCompatibleName(serializedFileID);
                            // deleting them from the disk as well
                            // we have a subfolder for each document
                            File toDelete = new File(file, serializedFileID + ".annic");
                            if (toDelete.exists())
                                toDelete.delete();
                        }
                        if (file.exists() && file.isDirectory()) {
                            file.delete();
                        }
                        System.out.println("Done ");
                    }
                }
            // for (remove all removed documents)
            }
        } finally {
            reader.close();
        }
    } catch (java.io.IOException ioe) {
        throw new IndexException(ioe);
    }
}

Example 2 with IndexReader

use of gate.creole.annic.apache.lucene.index.IndexReader in project gate-core by GateNLP.

the class LuceneSearcher method getIndexedAnnotationSetNames.

/**
 * This method returns a set of annotation set names that are indexed. Each
 * entry has the following format:
 * <p>
 * corpusName;annotationSetName
 * </p>
 * where, the corpusName is the name of the corpus the annotationSetName
 * belongs to.
 */
@Override
public String[] getIndexedAnnotationSetNames() throws SearchException {
    String indexLocation;
    try {
        indexLocation = new File(((URL) datastore.getIndexer().getParameters().get(Constants.INDEX_LOCATION_URL)).toURI()).getAbsolutePath();
    } catch (URISyntaxException use) {
        indexLocation = new File(((URL) datastore.getIndexer().getParameters().get(Constants.INDEX_LOCATION_URL)).getFile()).getAbsolutePath();
    }
    annotationTypesMap = new HashMap<String, List<String>>();
    Set<String> toReturn = new HashSet<String>();
    try {
        IndexReader reader = IndexReader.open(indexLocation);
        try {
            // lets first obtain stored corpora
            TermEnum terms = reader.terms(new Term(Constants.ANNOTATION_SET_ID, ""));
            if (terms == null) {
                return new String[0];
            }
            // iterating over terms and finding out names of annotation sets indexed
            Set<String> annotSets = new HashSet<String>();
            boolean foundAnnotSet = false;
            do {
                Term t = terms.term();
                if (t == null)
                    continue;
                if (t.field().equals(Constants.ANNOTATION_SET_ID)) {
                    annotSets.add(t.text());
                    foundAnnotSet = true;
                } else {
                    if (foundAnnotSet)
                        break;
                }
            } while (terms.next());
            // but not all documents belong to corpora
            for (String annotSet : annotSets) {
                Term term = new Term(Constants.ANNOTATION_SET_ID, annotSet);
                TermQuery tq = new TermQuery(term);
                try {
                    gate.creole.annic.apache.lucene.search.Searcher searcher = new IndexSearcher(indexLocation);
                    try {
                        Hits annotSetHits = searcher.search(tq);
                        for (int i = 0; i < annotSetHits.length(); i++) {
                            Document luceneDoc = annotSetHits.doc(i);
                            String corpusID = luceneDoc.get(Constants.CORPUS_ID);
                            if (corpusID == null)
                                corpusID = "";
                            toReturn.add(corpusID + ";" + annotSet);
                            // lets create a boolean query
                            Term annotSetTerm = new Term(Constants.ANNOTATION_SET_ID, annotSet);
                            TermQuery atq = new TermQuery(annotSetTerm);
                            BooleanQuery bq = new BooleanQuery();
                            bq.add(tq, true, false);
                            bq.add(atq, true, false);
                            gate.creole.annic.apache.lucene.search.Searcher indexFeatureSearcher = new IndexSearcher(indexLocation);
                            try {
                                Hits indexFeaturesHits = searcher.search(bq);
                                for (int j = 0; j < indexFeaturesHits.length(); j++) {
                                    Document aDoc = indexFeaturesHits.doc(j);
                                    String indexedFeatures = aDoc.get(Constants.INDEXED_FEATURES);
                                    if (indexedFeatures != null) {
                                        String[] features = indexedFeatures.split(";");
                                        for (String aFeature : features) {
                                            // AnnotationType.FeatureName
                                            int index = aFeature.indexOf(".");
                                            if (index == -1) {
                                                continue;
                                            }
                                            String type = aFeature.substring(0, index);
                                            String featureName = aFeature.substring(index + 1);
                                            String key = corpusID + ";" + annotSet + ";" + type;
                                            List<String> listOfFeatures = annotationTypesMap.get(key);
                                            if (listOfFeatures == null) {
                                                listOfFeatures = new ArrayList<String>();
                                                annotationTypesMap.put(key, listOfFeatures);
                                            }
                                            if (!listOfFeatures.contains(featureName)) {
                                                listOfFeatures.add(featureName);
                                            }
                                        }
                                    }
                                }
                            } finally {
                                indexFeatureSearcher.close();
                            }
                        }
                    } finally {
                        searcher.close();
                    }
                } catch (IOException ioe) {
                    ioe.printStackTrace();
                    throw new SearchException(ioe);
                }
            }
        } finally {
            reader.close();
        }
    } catch (IOException ioe) {
        throw new SearchException(ioe);
    }
    return toReturn.toArray(new String[0]);
}